The reason the TI converters run at 192khz is something called upsampling. It is pretty common in digital hi-fi equipment.
Essentially the DAC is outputting at a higher rate than the audio engine because these creates smoother filtering on the digital to analog conversion which results in better stereo imaging and fullness of the sound.
A sample rate of 192k probably is not that useful in the actual synth engine (though I think 96k is).
Much of the advantage when you go beyond 96khz is simply the filtering for the A/D or D/A conversion. The higher the sample rate the wider the bandwidth for the anti-aliasing filters which allows more accurate impulse response. This is why DSD recording sounds very analog or realistic, with such a high sample rate they have essentially no digital filtering at all.
A friend of mine has a CD player that upsamples to 24/384khz. Although the source quality is limited, it is surprising how much better it sounds just by the upsampling on the output end.
Theoretically, 24/700k would sound pretty much identical in the level of presence and fullness as analog. We still have a long way to go.
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